Earl Hakon determined which of his captains should fight against these champions. It was customary in such battles for ship to fight against ship and man against man; but in most cases Hakon, whose forces greatly outnumbered those of his enemies, placed three of his longships against one of the vikings'. He himself was not matched against any one, but had to support the whole line and command it. His son Sweyn held the chief position in the centre of battle, facing the leader of the vikings. Against the division of Bui was placed a great Norwegian warrior named Thorkel Leira. The wing held by Vagn Akison and Olaf Triggvison was opposed by Earl Hakon's eldest son, Erik. Each chief had his own banner in the shield burg at his prow.

War horns were sounded, arrows of challenge were fired over the opposing fleets, the berserks on either side clashed their arms and bit the rims of their shields, working themselves into a wild war fury. Then the fleets closed in upon each other amid a storm of arrows, and the grim battle began.

The ships of the vikings were higher in the hull than those of the Norwegians, and this gave them an advantage, for, when the grapplings were thrown out and the ships were lashed together, the Jomsburgers could fire their arrows and spears down upon the heads of their foes. The onset and attack were faultlessly made, and for a long while it seemed uncertain which side was getting the better hand. But at length Earl Hakon, who was supporting his son Sweyn against Sigvaldi, saw that his northern wing was being forced backward, and he hastened to its aid. Nevertheless, Bui the Thick still pressed the Norwegians back with heavy blows and a ceaseless rain of arrows and spears, and it seemed that at this point the vikings were quickly gaining the victory. On the southern wing, however, the fight was more equal, and Earl Erik thought that he would go to his brother's help. He went thither, accordingly, but could do no more than set the wing in line again. Hakon then returned to fight against Sigvaldi.

Now, by this short absence, Earl Erik had weakened the southern wing, and, when he came back to defend his ships, he found that Vagn Akison and Olaf Triggvison had broken through the line and made great havoc. Erik was a brave warrior, however, and he did not hesitate to make a bold attack upon the ships of these two champions. He encountered them with four of his best longships against their two. The battle at this point now grew furious, and the carnage on both sides was tremendous. Vagn and Olaf, followed by their berserks, jumped on board Erik's ship, and each went along either side of her, clearing his way, so that all fell back before the mighty blows. Erik saw that these two warriors were so fierce and mad that he would not long be able to withstand them, and that Earl Hakon's help must be got as quickly as possible. Yet he goaded his men on, and they made a brave resistance. Olaf was often attacked by three or four berserks at once, but he guarded every blow, and received but little hurt. He fought whiles with his sword and whiles with his battleaxe, and at times even with both weapons, one in either hand, dealing many hard and heavy blows, and slaying many a man. And ever when the decks were cleared there came on board other hosts of men from the neighbouring ships. Olaf wanted to come to a hand to hand combat with Earl Erik, but Erik always avoided him.

In the midst of this conflict one of Erik's men went forward and cut the lashings that bound the ships together, so that Olaf's dragonship drifted apart. Olaf noticed this, and he fought his way across the deck to where Vagn Akison was. At this moment there was a great onrush of Norwegians, and Vagn and Olaf sought the safety of one of their own ships. They jumped on board of her, and had her rowed some distance away, so that they might rest themselves and make ready for a new attack.

There was then a pause in the battle, and it was seen that Earl Hakon's ship had been taken landward, out of reach of the Jomsvikings' arrows. The legend tells that, seeing the battle going against him, he took some men ashore with him, together with his little son Erling--a lad of seven years of age. Entering a forest glade he prayed to the gods, and offered to propitiate them by making human sacrifice. When he thought that his vows and prayers were heard, he took young Erling and put him to death. Then he returned to the battle, and there was a sudden change in the weather. The sky began to darken in the north, and a heavy black cloud glided up from the sea, spreading quickly. A shower of hailstones followed at once, and the Jomsvikings had to fight with their faces against the blinding storm, which was so terrible that some of the men could do no more than stand against it, as they had previously taken off their clothes on account of the heat. They began to shiver, though for the most part they fought bravely enough.

Hakon Jarl now had the advantage, confident that the gods had accepted the sacrifice of his son, and intended to give him the victory. It is said that some saw the maidens of Odin, the Valkyrias, standing at the prow of Hakon's ship, sending forth a deadly hail of unerring arrows.

The vikings fought half blindly, though they were sorely pressed, and their decks were slippery with the slush of blood and melting hail, and in spite of the twilight and the raging storm they still held their own. But at last Earl Sigvaldi began to lose heart.

"It seems to me," he cried, "that it is not men whom we have to fight today, but the worst fiends."

Some one reminded him of the vow he had taken at King Sweyn's inheritance feast.